/* Copyright 2008 Bas van den Berg
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef TASKQUEUE_H
#define TASKQUEUE_H

#include <string>
#include <map>

namespace Chronos {

class StringBuilder;

class Task {
public:
    Task() : next(0) {}
    virtual ~Task() {}

    virtual unsigned int run() = 0;

    Task* next;
private:
    Task(const Task&);
    Task& operator=(const Task&);
};


class TaskQueue {
public:
    TaskQueue(unsigned int startTime);
    ~TaskQueue();

    void addTask(Task* task, unsigned int delay);
    void runNextTime();
    void printStatus(StringBuilder& buffer) const;
private:
    class TaskTime;
    void runTasks(TaskTime* taskTime);

    typedef std::map<unsigned int, TaskTime*> TaskTimes;
    typedef TaskTimes::iterator TaskTimesIter;
    typedef TaskTimes::const_iterator TaskTimesConstIter;
    TaskTimes times;
    
    unsigned int currentTime;
    unsigned int taskCount;

    TaskQueue(const TaskQueue&);
    TaskQueue& operator=(const TaskQueue&);
};

}

#endif

